Commit | Line | Data |
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76797561 | 1 | /* |
616af90a KB |
2 | * Copyright (c) 1980 The Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
6ecf3d85 | 5 | * %sccs.include.redist.c% |
76797561 | 6 | */ |
fb89c9af | 7 | |
76797561 | 8 | #ifndef lint |
6ecf3d85 | 9 | static char sccsid[] = "@(#)vgrindefs.c 5.3 (Berkeley) %G%"; |
616af90a | 10 | #endif /* not lint */ |
fb89c9af KM |
11 | |
12 | #define BUFSIZ 1024 | |
13 | #define MAXHOP 32 /* max number of tc= indirections */ | |
14 | ||
15 | #include <ctype.h> | |
fb89c9af KM |
16 | /* |
17 | * grindcap - routines for dealing with the language definitions data base | |
18 | * (code stolen almost totally from termcap) | |
19 | * | |
20 | * BUG: Should use a "last" pointer in tbuf, so that searching | |
21 | * for capabilities alphabetically would not be a n**2/2 | |
22 | * process when large numbers of capabilities are given. | |
23 | * Note: If we add a last pointer now we will screw up the | |
24 | * tc capability. We really should compile termcap. | |
25 | * | |
26 | * Essentially all the work here is scanning and decoding escapes | |
27 | * in string capabilities. We don't use stdio because the editor | |
28 | * doesn't, and because living w/o it is not hard. | |
29 | */ | |
30 | ||
31 | static char *tbuf; | |
1a8c1b81 | 32 | static char *filename; |
fb89c9af KM |
33 | static int hopcount; /* detect infinite loops in termcap, init 0 */ |
34 | char *tskip(); | |
35 | char *tgetstr(); | |
36 | char *tdecode(); | |
37 | char *getenv(); | |
38 | ||
39 | /* | |
40 | * Get an entry for terminal name in buffer bp, | |
41 | * from the termcap file. Parse is very rudimentary; | |
42 | * we just notice escaped newlines. | |
43 | */ | |
1a8c1b81 RC |
44 | tgetent(bp, name, file) |
45 | char *bp, *name, *file; | |
fb89c9af KM |
46 | { |
47 | register char *cp; | |
48 | register int c; | |
49 | register int i = 0, cnt = 0; | |
50 | char ibuf[BUFSIZ]; | |
51 | char *cp2; | |
52 | int tf; | |
53 | ||
54 | tbuf = bp; | |
55 | tf = 0; | |
1a8c1b81 | 56 | filename = file; |
fb89c9af KM |
57 | tf = open(filename, 0); |
58 | if (tf < 0) | |
59 | return (-1); | |
60 | for (;;) { | |
61 | cp = bp; | |
62 | for (;;) { | |
63 | if (i == cnt) { | |
64 | cnt = read(tf, ibuf, BUFSIZ); | |
65 | if (cnt <= 0) { | |
66 | close(tf); | |
67 | return (0); | |
68 | } | |
69 | i = 0; | |
70 | } | |
71 | c = ibuf[i++]; | |
72 | if (c == '\n') { | |
73 | if (cp > bp && cp[-1] == '\\'){ | |
74 | cp--; | |
75 | continue; | |
76 | } | |
77 | break; | |
78 | } | |
79 | if (cp >= bp+BUFSIZ) { | |
80 | write(2,"Vgrind entry too long\n", 23); | |
81 | break; | |
82 | } else | |
83 | *cp++ = c; | |
84 | } | |
85 | *cp = 0; | |
86 | ||
87 | /* | |
88 | * The real work for the match. | |
89 | */ | |
90 | if (tnamatch(name)) { | |
91 | close(tf); | |
92 | return(tnchktc()); | |
93 | } | |
94 | } | |
95 | } | |
96 | ||
97 | /* | |
98 | * tnchktc: check the last entry, see if it's tc=xxx. If so, | |
99 | * recursively find xxx and append that entry (minus the names) | |
100 | * to take the place of the tc=xxx entry. This allows termcap | |
101 | * entries to say "like an HP2621 but doesn't turn on the labels". | |
102 | * Note that this works because of the left to right scan. | |
103 | */ | |
104 | tnchktc() | |
105 | { | |
106 | register char *p, *q; | |
107 | char tcname[16]; /* name of similar terminal */ | |
108 | char tcbuf[BUFSIZ]; | |
109 | char *holdtbuf = tbuf; | |
110 | int l; | |
111 | ||
112 | p = tbuf + strlen(tbuf) - 2; /* before the last colon */ | |
113 | while (*--p != ':') | |
114 | if (p<tbuf) { | |
115 | write(2, "Bad vgrind entry\n", 18); | |
116 | return (0); | |
117 | } | |
118 | p++; | |
119 | /* p now points to beginning of last field */ | |
120 | if (p[0] != 't' || p[1] != 'c') | |
121 | return(1); | |
122 | strcpy(tcname,p+3); | |
123 | q = tcname; | |
124 | while (q && *q != ':') | |
125 | q++; | |
126 | *q = 0; | |
127 | if (++hopcount > MAXHOP) { | |
128 | write(2, "Infinite tc= loop\n", 18); | |
129 | return (0); | |
130 | } | |
1a8c1b81 | 131 | if (tgetent(tcbuf, tcname, filename) != 1) |
fb89c9af KM |
132 | return(0); |
133 | for (q=tcbuf; *q != ':'; q++) | |
134 | ; | |
135 | l = p - holdtbuf + strlen(q); | |
136 | if (l > BUFSIZ) { | |
137 | write(2, "Vgrind entry too long\n", 23); | |
138 | q[BUFSIZ - (p-tbuf)] = 0; | |
139 | } | |
140 | strcpy(p, q+1); | |
141 | tbuf = holdtbuf; | |
142 | return(1); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Tnamatch deals with name matching. The first field of the termcap | |
147 | * entry is a sequence of names separated by |'s, so we compare | |
148 | * against each such name. The normal : terminator after the last | |
149 | * name (before the first field) stops us. | |
150 | */ | |
151 | tnamatch(np) | |
152 | char *np; | |
153 | { | |
154 | register char *Np, *Bp; | |
155 | ||
156 | Bp = tbuf; | |
157 | if (*Bp == '#') | |
158 | return(0); | |
159 | for (;;) { | |
160 | for (Np = np; *Np && *Bp == *Np; Bp++, Np++) | |
161 | continue; | |
162 | if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0)) | |
163 | return (1); | |
164 | while (*Bp && *Bp != ':' && *Bp != '|') | |
165 | Bp++; | |
166 | if (*Bp == 0 || *Bp == ':') | |
167 | return (0); | |
168 | Bp++; | |
169 | } | |
170 | } | |
171 | ||
172 | /* | |
173 | * Skip to the next field. Notice that this is very dumb, not | |
174 | * knowing about \: escapes or any such. If necessary, :'s can be put | |
175 | * into the termcap file in octal. | |
176 | */ | |
177 | static char * | |
178 | tskip(bp) | |
179 | register char *bp; | |
180 | { | |
181 | ||
182 | while (*bp && *bp != ':') | |
183 | bp++; | |
184 | if (*bp == ':') | |
185 | bp++; | |
186 | return (bp); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Return the (numeric) option id. | |
191 | * Numeric options look like | |
192 | * li#80 | |
193 | * i.e. the option string is separated from the numeric value by | |
194 | * a # character. If the option is not found we return -1. | |
195 | * Note that we handle octal numbers beginning with 0. | |
196 | */ | |
197 | tgetnum(id) | |
198 | char *id; | |
199 | { | |
200 | register int i, base; | |
201 | register char *bp = tbuf; | |
202 | ||
203 | for (;;) { | |
204 | bp = tskip(bp); | |
205 | if (*bp == 0) | |
206 | return (-1); | |
207 | if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) | |
208 | continue; | |
209 | if (*bp == '@') | |
210 | return(-1); | |
211 | if (*bp != '#') | |
212 | continue; | |
213 | bp++; | |
214 | base = 10; | |
215 | if (*bp == '0') | |
216 | base = 8; | |
217 | i = 0; | |
218 | while (isdigit(*bp)) | |
219 | i *= base, i += *bp++ - '0'; | |
220 | return (i); | |
221 | } | |
222 | } | |
223 | ||
224 | /* | |
225 | * Handle a flag option. | |
226 | * Flag options are given "naked", i.e. followed by a : or the end | |
227 | * of the buffer. Return 1 if we find the option, or 0 if it is | |
228 | * not given. | |
229 | */ | |
230 | tgetflag(id) | |
231 | char *id; | |
232 | { | |
233 | register char *bp = tbuf; | |
234 | ||
235 | for (;;) { | |
236 | bp = tskip(bp); | |
237 | if (!*bp) | |
238 | return (0); | |
239 | if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) { | |
240 | if (!*bp || *bp == ':') | |
241 | return (1); | |
242 | else if (*bp == '@') | |
243 | return(0); | |
244 | } | |
245 | } | |
246 | } | |
247 | ||
248 | /* | |
249 | * Get a string valued option. | |
250 | * These are given as | |
251 | * cl=^Z | |
252 | * Much decoding is done on the strings, and the strings are | |
253 | * placed in area, which is a ref parameter which is updated. | |
254 | * No checking on area overflow. | |
255 | */ | |
256 | char * | |
257 | tgetstr(id, area) | |
258 | char *id, **area; | |
259 | { | |
260 | register char *bp = tbuf; | |
261 | ||
262 | for (;;) { | |
263 | bp = tskip(bp); | |
264 | if (!*bp) | |
265 | return (0); | |
266 | if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) | |
267 | continue; | |
268 | if (*bp == '@') | |
269 | return(0); | |
270 | if (*bp != '=') | |
271 | continue; | |
272 | bp++; | |
273 | return (tdecode(bp, area)); | |
274 | } | |
275 | } | |
276 | ||
277 | /* | |
278 | * Tdecode does the grung work to decode the | |
279 | * string capability escapes. | |
280 | */ | |
281 | static char * | |
282 | tdecode(str, area) | |
283 | register char *str; | |
284 | char **area; | |
285 | { | |
286 | register char *cp; | |
287 | register int c; | |
288 | int i; | |
289 | ||
290 | cp = *area; | |
291 | while (c = *str++) { | |
292 | if (c == ':' && *(cp-1) != '\\') | |
293 | break; | |
294 | *cp++ = c; | |
295 | } | |
296 | *cp++ = 0; | |
297 | str = *area; | |
298 | *area = cp; | |
299 | return (str); | |
300 | } |